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Part number 550-143-013/0621
5
Series 3
Please read before proceeding
• Read all instructions, including this manual, the burner
manual and any related supplements. Perform steps in
the order given. Failure to comply could result in severe
personal injury, death or substantial property damage.
• To avoid electric shock, disconnect electrical supply before
performing maintenance.
• To avoid severe burns, allow boiler to cool before perform-
ing maintenance.
• Do not block ow of combustion or ventilation air to
burner.
• Should overheating occur or fuel supply fail to shut o, do
not turn o or disconnect electrical supply to circulator.
Instead, shut o the fuel supply at a location external to
the appliance.
• Do not use this boiler if any part has been under water.
Electrical and mechanical failures may cause electric
shock and re risks. Immediately inspect chimney or vent,
boiler, burner and controls. Clean the boiler ueways and
replace all electrical and mechanical controls; all electrical
wiring; oil burner and controls; insulation and chamber
lining.
• Do not reduce the ring rate of the boiler. Use only the oil
nozzle size specied. Reduced input will cause condensa-
tion in the boiler and vent piping.
• e boiler contains ceramic ber materials. Use care when
handling these materials per instructions on page 26 of
this manual. Failure to comply could result in severe
personal injury.
• oroughly ush the system (without boiler connected)
to remove sediment. e boiler heat exchanger can be
damaged by build-up or corrosion due to sediment.
• Do not use petroleum-based cleaning or sealing com-
pounds in boiler system. Gaskets and seals in the system
may be damaged. is can result in substantial property
damage.
• Do not use “homemade cures” or “boiler patent medicines.”
Serious damage to boiler, personnel and/or property may
result.
• Continual fresh make-up water will reduce boiler life. Min-
eral buildup in boiler sections reduces heat transfer, over-
heats the sections, and causes failure. Addition of oxygen
carried in by make-up water can cause internal corrosion.
Leaks in boiler or piping must be repaired at once to prevent
make-up water.
• Do not add cold water to hot boiler. ermal shock can
cause heat exchanger to crack.
• When using antifreeze — Do not use automotive, ethylene
glycol, undiluted or petroleum-based antifreeze. See the
WARNING on page 23 for more information.
Saltwater Damage e exposure of boiler components
to saltwater can have both immediate and long-term eects.
While the immediate eects of saltwater damage are similar
to those of freshwater (shorting out of electrical components,
washing out of critical lubricants, etc.), the salt and other
contaminants le behind can lead to longer term issues aer
the water is gone due to the conductive and corrosive nature
of the salt residue. erefore, Weil-McLain equipment con-
taminated with saltwater or polluted water will no longer be
covered under warranty and should be replaced.
If any wir-
i
came into contact with water, or was suspected to have
come into contact with water, replace the boiler with a new
Weil-McLain boiler.
Frozen Water Damage Hazard
Residences or buildings that are unattended in severely cold
weather, boiler system components failures, power outages,
or other electrical system failures could result in frozen
plumbing and water damage in a matter of hours. For your
protection, take preventative actions such as having a security
system installed that operates during power outages, senses
low temperature, and initiates an eective action. Consult
with your boiler contractor or a home security agency.
Follow the guidelines below to prevent possible severe personal injury, death or substantial property damage.
Follow the guidelines below to prevent severe personal injury, death or substantial property damage.
Fuel
• Do not use crankcase drainings or any oil containing
gasoline. See burner manual for proper fuel oil.
• Never burn garbage or paper in the boiler. Never leave
combustible material around boiler.
Do not tamper with burner/controls
• Always follow specic instructions when starting up
boiler or performing routine maintenance or service.
Do not start burner if:
• Do not attempt to start burner when excess oil has ac-
cumulated in combustion chamber, when unit is full of
vapor, or when combustion chamber is very hot.
• Do not start burner unless breeching and burner mount-
ing door are secured in place.
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